Environmentally-friendly desulfurization process for zinc smelting system

A desulfurization process and zinc smelting technology, applied in the field of desulfurization process, can solve the problems of inability to ensure the discharge of high-concentration sulfur dioxide-containing flue gas up to the standard, pipeline blockage, etc., and achieve good environmental protection benefits, not easy to block, and improve the effect of removal rate

Inactive Publication Date: 2019-07-02
ZHUZHOU SMELTER GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main purpose is to solve the problem of pipe blockage in the current technology and the inability to ensure the discharge of high-concentration sulfur dioxide-containing flue gas up to the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Example 1, the present invention relates to a flue gas desulfurization process for a zinc smelting system, including a ZnO slurry manufacturing part, a primary desulfurization part, a secondary desulfurization part, and a tertiary desulfurization part.

[0021] (1) The manufacturing part of ZnO pulp includes: after casting the zinc scum after sorting the metal zinc block, sieving the metal zinc particles, and then entering the ball milling process, the particle size of the scum powder is D90 75μ, and the finely ground scum powder After hearth furnace treatment, the fluorine content in the zinc dross is 0.07%, the chlorine content is 0.2%, and the zinc oxide content is 95.5%. The scum powder after the above-mentioned treatment enters the pulping tank, adds water for pulping, and the ZnO concentration after pulping reaches 12%. D90 15μ.

[0022] (2) Primary desulfurization part: The prepared ZnO slurry is sprayed into the primary absorption tower to react with sulfur dio...

example 2

[0024] Example 2. The invention relates to a flue gas desulfurization process for a zinc smelting system, which includes a ZnO slurry manufacturing part, a primary desulfurization part, a secondary desulfurization part and a tertiary desulfurization part.

[0025] (1) The manufacturing part of ZnO pulp includes: after casting the zinc scum after sorting the metal zinc block and sieving the metal zinc particles, it enters the ball milling process, and the scum powder particle size is D90 70μ. After the multi-stage alkaline cleaning treatment, the fluorine content in the zinc dross is 0.1%, the chlorine content is 0.3%, and the zinc oxide content is 90.5%. After the above treatment, the scum powder enters the pulping tank, adds water and the slurry returned from the aeration tank for pulping, and the concentration of ZnO after pulping reaches 10%, and then enters the vertical mill process for further grinding after pulping in the pulping tank Zinc oxide forms ZnO slurry with a ...

example 3

[0029] Example 3, the present invention relates to a flue gas desulfurization process for a zinc smelting system, including a ZnO slurry manufacturing part, a primary desulfurization part, a secondary desulfurization part, and a tertiary desulfurization part.

[0030] (1) The manufacturing part of ZnO pulp includes: the zinc scum after casting is sorted into metal zinc blocks, sieved metal zinc particles, and then enters the ball milling process. After the fine scum powder is treated with one or more stages of alkali washing, the fluorine content in the zinc scum is 0.05%, and the chlorine content is 0.25%. After the above treatment, the scum powder enters the pulping tank, adds water and the slurry returned from the aeration tank for pulping, and the ZnO concentration after pulping reaches 15%, and then enters the vertical mill process for further grinding after pulping in the pulping tank Zinc oxide forms ZnO slurry with a particle size of D90 10μ.

[0031] (2) Primary desu...

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Abstract

The invention relates to a flue gas desulfurization process used for a zinc smelting system. The process comprises the following steps: preparing ZnO slurry: after zinc scum is casted, performing ballmilling, separating metal zinc, performing defluorination and dechlorination on the scum powder until the fluorine content is not more than 0.1% and the chlorine content is not more than 0.3% in thezinc scum, performing slurrying in a slurrying tank, allowing the obtained slurry to enter a vertical mill process, and further grinding the zinc oxide to form ZnO slurry; performing first-stage desulfurization: spraying a prepared ZnO slurry into a first-stage absorption tower, and reacting the ZnO slurry with sulfur dioxide in washed zinc smelting system flue gas; performing second-stage desulfurization, and performing third-stage desulfurization. The process is characterized in that zinc sulfite slurry formed after the reaction is concentrated, the supernatant is discharged into an aerationoxidation tank, after the bottom stream is filtered, the filtrate is discharged into the aeration oxidation tank, the solution obtained by oxidation in the aeration oxidation tank returns to the slurrying tank in the ZnO slurry preparation part for recycling, after a zinc ion concentration in the solution reaches 150 g/L, the material is sent to a zinc purification system for further treatment without deposition, and the filter residues are sent to a zinc sulfite bin to be treated together with other zinc-containing materials for comprehensive recovery of zinc. The process provided by the invention has no harmful waste gas, waste residues or waste water.

Description

technical field [0001] The invention relates to a desulfurization process for flue gas containing sulfur dioxide in a zinc smelting system, and belongs to the technical field of flue gas desulfurization in a zinc smelting system. Background technique [0002] At present, the commonly used desulfurization methods mainly include: lime method, sodium calcium double alkali method, soda ash method, ammonia soda method, magnesium oxide method, zinc oxide method, hydrogen peroxide method, etc., each method has corresponding advantages and disadvantages. [0003] Lime method and sodium-calcium double-alkali method generate waste during the desulfurization process, causing secondary pollution and low desulfurization efficiency; soda ash method, ammonia-soda method, magnesium oxide method, and hydrogen peroxide method all have problems such as high cost. [0004] The advantages of the zinc oxide method are low operating costs, no waste, and no secondary pollution. It has been widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78
CPCB01D53/502B01D53/78
Inventor 王文军刘敏张天芳
Owner ZHUZHOU SMELTER GRP
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